104results about How to "Eliminate manufacturing errors" patented technology

The invention discloses a lifting stationarity control system and a mining dump truck and belongs to the field of mechanical control. The Lifting stationarity control system comprises a truck bed 1, a frame 2, a lifting mechanism 3, a controller 4, and an angular displacement sensor 5, wherein the truck bed 1 is hinged to the frame 2; the lifting mechanism 3 can extend and contract to drive the truck bed 1 to ascend or descend relative to the frame 2; the controller 4 is connected with the lifting mechanism 3; the angular displacement sensor 5 is arranged on the truck bed 1 and the frame 2 and is connected with the controller 4; the angular displacement sensor 5 is used for detecting an angular displacement signal of the truck bed 1 relative to the frame 2 and transmitting the signal to the controller 4; and the controller 4 is used for controlling the movement velocity of the truck bed 1 through the lifting mechanism 3 according to the signal. According to the technical scheme of the invention, angle valves collected by the angular displacement sensor are used as controller input signals and signal acquisition section is wide, so that the defects that the rotation angle of an electronic control handle is small and the controllability of a value element is bad are avoided, the effects of throttling and buffering are realized, and the service life of parts is prolonged.

The invention discloses a cantilever beam robustness self-adaptation control method. An ideal cantilever beam dynamic model is designed and contains frequency signals rich enough to serve as a reference trajectory of a system, it is guaranteed that the actual cantilever beam trajectory can track the reference trajectory for the whole self-adaptation control system, an ideal dynamic property is realized, and compensation of manufacturing errors and environment disturbance is achieved. The parameters of a cantilever beam are taken as unknown system parameters, a parameter error vector theta is formed, a slip form function is designed, the derivative of the slip form function is made to be zero, an equivalent controller is obtained, a feedback term and a robustness term serve as an input signal on this basis, the self-adaptation rule of the parameter theta of the controller is designed based on the Lyapunov method, the stability of the system is guaranteed, tracking error is converged to zero, and all the parameters are converged to true values.

The invention discloses a self-adaptive control method of a sliding formwork of a micro gyroscope based on a T-S fuzzy model. The T-S fuzzy model of the micro gyroscope is established based on a nonlinear model of the micro gyroscope, a global uncertain system model of the micro gyroscope is obtained through single-point fuzzification, product ratiocination and central equal-weighted defuzzification, a controller is designed based on an uncertain system variable structure control theory, and the a model trajectory of the global uncertain system model is made to trace a reference model trajectory. Due to the fact that an interference upper bound and a parameter uncertain item are unknown, estimators are designed respectively. A self-adaptive control algorithm is designed based on Lyapunov theory to guarantee the global asymptotic stability of the system. Under the situation that the parameter uncertain item and interference exist in the T-S fuzzy model of the micro gyroscope, the self-adaptive control method of the sliding formwork of the micro gyroscope based on the T-S fuzzy model can carry out accurate trajectory tracing control on a nonlinear controlled object, and the global asymptotic stability of trajectory control errors and parameter estimation errors can be guaranteed, the self-adaptive control of the sliding formwork can improve the robustness of the parameter variation by the system and compensate manufacturing errors, and due to the fact that a control scheme acts on the nonlinear model simultaneously, the effectiveness of the control scheme on the nonlinear model is verified.

The invention relates to a method for mounting a water beam of a walking beam heating furnace in a thermal state, namely a simulated working state. The method is characterized in that: an assembly welding method for the water beam and an upright post at the temperature of 273+ / -10 DEG C is completely simulated through a heating incubator and a temperature control system, and comprises the following operating steps of: 1) determining the verticality and elevation of a double-barreled upright post, and fixedly welding the double-barreled upright post; 2) calculating the heated elongation of the water beam; 3) taking the double-barreled upright post as a center, correspondingly determining center distance among other upright posts according to the elongation, and fixedly welding all the upright posts; 4) correcting out-of-tolerance dimension among the upright posts after finishing the welding; 5) arranging a heating box; 6) heating the water beam, and matching with welding; and 7) keeping the temperature and cooling, wherein the heating box is arranged and controlled in sections. The invention has the advantages that: the service life is obviously prolonged, the welding stress in a cold drawing state is eliminated, and the fabrication error of the water beam can be effectively eliminated in the construction process.

The present invention relates to the machining of mechanical parts in digitally controlled machine tool. The semi-intelligent position searching and machining method in digitally controlled machine tool features that the position searching device inside the main shaft hole is used to search the coordinates of two characteristic surfaces O1(X1, Y1) and O2(X2, Y2) or orientation O1O2 of the workpiece; the rotation angle between the workpiece coordinate system and the machine tool coordinate system is calculated and input into the digital control program, and the rotation angle may be calculated automatically in the digital control system with relatively powerful function; and the workpiece may be program machined via coordinate translation of the cutting point and starting the digital control program. The present invention has the features of simple equipment, high machining precision and simple operation.

A damping and hovering structure of a furniture tilt-up door comprises a fixing seat, a spring, a connecting arm component and a retaining element. The connecting arm component at least comprises a first connecting arm, a second connecting arm and a middle arm; the first connecting arm and / or the second connecting arm is hinged to the fixing seat, the middle arm is hinged to the fixing seat and / or the retaining element, and the retaining element is opened and closed on the fixing seat in a turnover manner under the action of the spring; a damping and hovering unit is arranged on the retaining element and comprises a hovering damper and a pushing element; when the retaining element is opened and closed within a certain acute angle range, the hovering damper is at the initial position and basically does not generate damping force; when the retaining element is opened and closed beyond the certain acute angle range, the middle arm acts on the hovering damper through elasticity of the spring and / or loading capacity of the retaining element, the hovering damper generates damping force, and elasticity of the spring and / or loading capacity of the retaining element is offset through the damping force, so that the retaining element can hover anytime when being opened and closed beyond the certain acute-angle range.

The invention discloses a silicon-based tunable polarization rotator. The silicon-based tunable polarization rotator is characterized in that: the design and production of the silicon-based tunable polarization rotator are based on the planar optical waveguide technology and the semiconductor technology, and the dynamic tunable conversion between TEO and TMO polarization states in waveguide can be achieved. The tunable polarization rotator mainly comprises three functional devices, namely, 101, a symmetry polarization rotation separation device, 102, a phase shift arm and 103, a reversely symmetry polarization rotation separation device, wherein the structure of the functional device 101 can be realized through an adiabatic coupler or an asymmetric double-layer taper, and a symmetric branch; the functional device 102 can be electro optic and thermo-optic in structure; the structure of the functional device 103 can be achieved through an adiabatic coupler or an asymmetric double-layer taper, and a symmetric branch. Compared with various conventional tunable polarization rotators, the silicon-based tunable polarization rotator has the advantage of CMOS compatibility based on the silicon-based planar optical waveguide technology; the device is simple in structure and production technology.

The invention discloses a vehicle body and a vehicle with the vehicle body. The vehicle body comprises a left seat reinforcing component and a right seat reinforcing component, wherein at least one of the left seat reinforcing component and the right seat reinforcing component comprises a doorsill side beam, a front seat cross beam component and a doorsill reinforcing member; a cavity which extends longitudinally is arranged in the doorsill side beam; the outer end of the front seat cross beam component is connected with the doorsill side beam; the doorsill reinforcing member is transversely connected into the cavity; a part of the doorsill reinforcing member and the front seat cross beam component are welded to the corresponding doorsill side beam to form a three-layer welding structure. According to the vehicle body provided by the embodiment of the invention, the safety performance during collision of the side face of the vehicle body is high, and a living space is remained for passengers in the vehicle.

A mechanical overspeed protector for escalator is composed of a rotation unit consisting of rotating bottom plate, spring, weight and limiting screw, and a control arm unit consisting of drive rod, slide rod and bent rod.

The invention discloses an incremental absolute grating ruler-based absolute displacement detection method. The method included the following steps that: an incremental type grating ruler is marked, so that the incremental type grating ruler can be converted into an incremental absolute grating ruler, and the uniqueness of each grid line is guaranteed; grating images are collected and de-noised, and the grid lines of the grating ruler are extracted, a neural network model for deep learning is established, each grid line is trained, and the trained neural network model is stored; a mathematical model for displacement detection is established, the image of a grating ruler to be subjected to displacement detection is collected, and the trained neural network model is used for carrying out grid line recognition, and a recognized grid line number is fed back to the mathematical model, so that a displacement detection value can be calculated. According to the method of the invention, the incremental type grating ruler is converted into the incremental absolute grating ruler; the functions of the absolute grating ruler are realized through an incremental mode; and the manufacturing precision of the grating ruler is greatly reduced.

Disclosed is an improved type universal fixture for machining a blade profile. The improved type universal fixture comprises a base, a self-centering two-jaw chuck, profile blocks, profile block fixing seats, a locating seat, a replaceable locating rod and a debugging standard part which is used for locating the universal fixture on a milling machine workbench. The self-centering two-jaw chuck is installed on the base. The number of the profile block fixing seats is two. The two profile block fixing seats are installed on the top faces of two clamping jaws of the self-centering two-jaw chuck respectively. The number of the profile blocks is two. Locating bosses of the two profile blocks are matched with second locating grooves of the two profile block fixing seats respectively. The locating seat is installed on the top face of the self-centering two-jaw chuck. The connection segment of the replaceable locating rod is installed in a rectangular through hole formed in an upright which is arranged on a locating seat body in an inserted mode, and the replaceable locating rod is fixed to the upright of the locating seat through a nut. When the debugging standard part is used, the locating bosses on the two side faces of a debugging standard part body are matched with the second locating grooves of the two profile block fixing seats respectively, and one end face of the debugging standard part body is attached to the upright arranged on the locating seat body.

The invention provides a confocal type laser test head based on a time difference method. A main mechanism of the test head comprises a laser, a splitting prism, a tuning fork lens, a coil component and a photoelectric receiver positioned in a photoelectric receiver sleeve, wherein a laser of the main mechanism is positioned inside a laser sleeve; an optical filter is positioned above the laser to form a laser component; the rear part of the laser component is provided with an aperture diaphragm component; the rear part of the aperture diaphragm component is provided with a plano-convex lens component; the rear part of the tuning fork lens is provided with a parallel light adjusting mechanism; the rear part of the parallel light adjusting mechanism is provided with an aspherical objective lens component; and the front end of the formed photoelectric receiver component is connected with an adjusting mechanism for radially adjusting a top thread. The confocal laser test head has the advantages of folding a light path to have compact shape dimension and attractive appearance. The confocal laser test head makes up the manufacturing error of a mechanical structure. The test head has large measuring range, small measuring light point, small shape dimension and high measuring precision.

The invention relates to a technical method for improving the precision of a RV reducer. The technical method is characterized in that temperatures of relevant parts are controlled to achieve control on part size and assembly relation is achieved and complete installation of interference parts and a self-adaptive researching process. The precision and use effect of the RV reducer obtained by the technical method are superior to these of the RV reducer with assembly parts singly machined by machine tools.

The invention discloses a miter saw and a cutting depth adjusting method for the same. A rotating shaft which synchronously rotates together with a working head of the miter saw is provided with an angle sensor to monitor the rotation angle of the rotating shaft so as to acquire the rotation angle of the working head, a microprocessor is used for performing conversion calculation between the rotation angle of the working head and the displacement of a circular saw web on the working head in the vertical direction, a display is used for output, and when cutting depth adjustment is carried out before the miter saw is used, a user can adjust the cutting depth of the miter saw according to a numerical value displayed on the display, and the adjustment accuracy is greatly improved; meanwhile, a standard feeler block is adopted in the adjustment process, so self manufacturing errors of the miter saw can be conveniently eliminated. The miter saw is simple in structure; in the using process, the cutting depth is convenient to adjust, the adjustment accuracy is high and the operability is high.

The invention discloses a method for adjusting the pre-tightening force of an angular contact bearing of an indexing mechanism of a positioning and orientating system. The method comprises the following steps: step one, measuring a height difference h between inner and outer rings of an angular contact bearing; step two, measuring a depth L1 from the outer ring end face of the angular contact bearing to the mounting surface of the outer frame; (3), measuring a height difference L2 between a step pressing surface and a mounting end surface of a bearing end cover before assembling; (4), carryingout match grinding of the step pressing surface of the bearing end cover before assembling with a set match grinding value; (5), making an annular aluminum foil pad with the thickness of 0.01mm underthe conditions of enabling the outer diameter of the annular aluminum foil pad to be smaller than the outer diameter of the outer ring of the angular contact bearing and the inner diameter of the annular aluminum foil pad to be larger than the inner diameter of the inner ring of the angular contact bearing; and (6), mounting at least one annular aluminum foil pad on the end surface of the angularcontact bearing and compressing the bearing end cover after match grinding on the annular aluminum foil pad to realize contact between the mounting end face of the bearing end cover and the outer frame. The method is suitable for a positioning and orientating system.

The invention discloses a fabricated composite bridge surface system of U-shaped bolt connecting parts with the adjustable screw pitch. The fabricated composite bridge surface system includes the U-shaped bolt shearing force connecting parts and an I-shaped steel beam, wherein the U-shaped bolt shearing force connecting parts are arranged on an upper frange plate of the I-shaped steel beam at intervals in the longitudinal direction of the I-shaped steel beam, concrete is poured on the upper frange plate on the I-shaped steel beam to form a concrete bridge surface panel, the concrete bridge surface panel is hoisted on a cover beam above a bridge pier, and thus a steel mixed-assembly fabricated composite bridge panel system is formed. According to the structural system, the effects that mounting errors are reduced, and connecting part initial rigidity is improved are achieved, thus the bearing capacity in the fabricated composite bridge panel system can be optimized, prefabricating and direct assembling can be achieved, convenience and fastness are achieved, and the construction progress is fast.

The invention relates to a load balancing control device and method, in particular to a load balancing control device and method for outriggers of a bridge erecting machine, and belongs to the field of bridge erecting construction equipment. By the customized amount of deformation of a left rubber bearing and a right rubber bearing of different stiffnesses, deformation of bearing a cross girder by the outriggers through the cantilever force is remedied, and the stress of supporting wheels on the two sides is coordinated, so that the purpose of load balancing is achieved; a supporting and lifting wheel assembly adopting multi-stage balanced beams and multi-wheel sets can not only disperse the large load between a main beam and the outriggers, but also ensure that the outriggers and the main beam can move relatively and operate smoothly; and a central shaft and a wearing plate are arranged between the center of a hinged support and a traverse platform to make the supporting and lifting wheel assembly rotate along with the swing of the main beam, and the angle between by the swinging main beam and the outriggers in curved beam erection is adapted.

The invention relates to a balancing or measuring device comprising a main body (2) which rotates about an axis of rotation (1) and includes an opening (3) for accommodating a coupling shaft (4) of a rotor (5), and comprising a centering element (6) for centering the rotor (5) in the opening (3). The centering element (6) includes at least one support zone (13, 16, 22, 25, 29) which rests against the coupling shaft (4) and is resilient in the radial direction.

The invention discloses a device for milling a left bearing pedestal and a right bearing pedestal, and belongs to the field of machining. The device comprises a support, a positioning sleeve and a limiting pin; the positioning sleeve is of a circular ring structure and is mounted on the support; the outer diameter of the positioning sleeve is equal to or slightly smaller than the inner diameter of a left bearing and a right bearing; a first limiting hole is formed in the position, corresponding to a through hole of the left bearing pedestal to be machined and the right bearing pedestal to be machined, of the positioning sleeve, and a second limiting hole is formed in the position, symmetric with the first limiting hole, of the positioning sleeve; the limiting pin is used for being inserted into the through hole of the left bearing pedestal to be machined and the right bearing pedestal to be machined and the limiting holes of the positioning sleeve, and therefore positioning of the left bearing pedestal to be machined and the right bearing pedestal to be machined on the positioning sleeve is achieved; and reliable and stable supporting can be formed on the left bearing pedestal to be machined and the right bearing pedestal to be machined, positioning is accurate, mounting is convenient, the production efficiency of the left bearing pedestal and the right bearing pedestal can be effectively improved, and the product machining precision is ensured.

A yarn feeder (F) comprising a storage body (2), at least one photoelectric reflective sensor (S), for the photoelectric reflective sensor (S), a reflector body (R) mounted in a storage body container (7) for For height adjustment between several different operating positions with respect to an adjacent storage surface (8), said reflector body (R) is arranged on bolts (9) passing through a spacer element (D), said spacer element (D) Arranged in the storage body container (7) and the countersunk element (K) is located on the lower surface (14) of the storage body container (7), characterized in that it includes at least one for all work of the reflector body (R) Preloaded and elastically compressible padding element (D) permanently retained in position in the storage body container (7).

The invention relates to a novel current transformer and an implementation method and belongs to the field of the transformer. The transformer comprises a high-voltage end module and a low-voltage endmodule. The transformer is characterized by further comprising a hollow coil and a long-distance wireless power supply device, wherein one end of an optical fiber is connected with a photoelectric conversion circuit module, and the other end is connected with the photoelectric conversion circuit module. By adopting an intelligent gain control circuit module, a manufacturing error of the hollow coil, parameter deviation of electronic components and the temperature drift of an electronic circuit caused by temperature and humidity changes are eliminated, and measurement precision is high. Through a pulse width modulation circuit module, an inverter drive circuit module, a power inverter bridge and a low-pass filter, a current transformer can output the same current value and power as a secondary end of a traditional electromagnetic current transformer, and is matched with various existing instruments and power distribution cabinets. A long-distance wireless power supply device solves a power supply problem of a high-voltage end acquisition head of the hollow coil type current transformer, has no power supply dead angle or measurement dead zone, and is convenient to maintain safely, good in stability and long in service life.

The invention discloses a self-adaptive floating mechanism, and relates to the technical field of positioning mechanisms. The self-adaptive floating mechanism is characterized in that a driving structure sliding table fixing base and a robot sliding table fixing base sleeves the two ends of a connecting rod respectively, and the two sides of the robot sliding table fixing base are sequentially andsymmetrically provided with a spring limiting sleeve, a rectangular spring and a second locking nut block; the second locking nut block is fastened and fixed with the connecting rod, the supporting sleeve is arranged on one side, close to the driving structure sliding table fixing base, of the robot sliding table fixing base and is connected to the robot sliding table fixing base; and the drivingstructure sliding table fixing base and the robot sliding table fixing base are fixedly connected to a driving mechanism sliding table and a robot sliding table respectively. According to the self-adaptive floating mechanism, a floating mechanism is arranged between a servo driving sliding table and a heavy-load sliding table, the floating mechanism is arranged between the servo driving sliding table and the heavy-load sliding table, the servo driving sliding table and the heavy-load sliding table are elastically connected in a certain floating range, the positioning error of a driving mechanism and the manufacturing error of a transmission mechanism are compensated, and the overall positioning precision of the system is greatly improved.

The invention proposes a connecting structure of a vehicle back floor cross beam and longitudinal beams. The connecting structure comprises the back floor cross beam and two back floor longitudinal beams; the two back floor longitudinal beams are fixedly connected with the back floor cross beam through connecting brackets; the connecting brackets include connecting plates as support bodies; connecting plate surfaces are arranged at the front ends of the connecting plates for gluing with the back floor cross beam; multiple connecting parts are formed on the back surfaces of the connecting plates; and the connecting parts are glued with the back floor longitudinal beams. The unique structure design of the connecting brackets realizes large-area gluing of the front ends of the connecting brackets and the back floor cross beam and one-way and two-side connection of the back ends of the connecting brackets and the back floor longitudinal beams so as to realize connection of profile cross beams and longitudinal beams and guarantee the connecting reliability; aluminum alloy profiles with better rigidity and strength are adopted; profile molds are lower in cost; and the production efficiency is high. As a structural glue bonding process is adopted, the strength of a gluing area is not influenced, the self manufacturing errors of parts and assembly errors among the parts can be eliminated, and the manufacturing precision is improved.

The invention discloses a planetary gear degradation state identification method. The method comprises the following steps of carrying out the optimized arrangement of a plurality of vibration sensorsand the original vibration signal acquisition; decomposing an original vibration signal into a plurality of SSDC components by adopting the adaptive improved singular spectrum decomposition, extracting the multi-scale enhanced information dimensions of the plurality of SSDC components to form a planetary gear degradation state characteristic matrix, and constructing a planetary gear degradation state recognition model based on a convolutional neural network. According to the method, the characteristic information matrix generated by the degradation state of the planetary gear can be extracted, the degradation state of the planetary gear is recognized according to the extracted characteristic information matrix, and the method is an effective planetary gear degradation state recognition method.

The application discloses a Z-axis gyroscope control method based on neural network identification parameters. According to the method, a micro-gyroscope tracking error and a designed sliding mode surface are obtained; a spring parameter matrix is estimated by using an RBF neural network based on the tracking error and the sliding mode surface; a micro-gyroscope control law is designed according to the sliding mode surface and the estimated spring parameters; and then accurate estimation of the spring parameters is realized. Therefore, the spring parameters can be estimated by using the neuralnetwork under the circumstances that the gyro system frame has an asymmetric structure and the spring parameters are unknown or a nominal value does not accord with an actual value; and the adaptiveadjustment of the weight is completed by designing an adaptive rule of the neural network weight, so that the stability of the system is ensured, and the measurement precision of the gyroscope is improved.

The invention discloses a deep exploration logging-while-drilling instrument, and belongs to the field of logging. The deep exploration logging-while-drilling instrument comprises a drill collar, a symmetric coil system composed of a plurality of receiving coils and a plurality of transmitting coils is arranged on the drill collar, the drill collar is further provided with a receiving coil and a transmitting coil, and the receiving coil, the transmitting coil and the coils of the symmetric coil system form an asymmetric coil system; the coils are respectively connected with an antenna to forman antenna assembly; and a mandrel assembly is sleeved with the drill collar, a groove and a wire groove are formed in a mandrel of the mandrel assembly, circuit boards are arranged on the groove, andall the circuit boards are communicated through electric wires in the wire groove. The deep exploration logging-while-drilling instrument is of a sleeve type structure and is composed of a drill collar assembly and the mandrel assembly, modular design of the instrument is achieved, the overall asymmetric and locally symmetric antenna structure layout is adopted, and the detection depth and detection precision of the deep exploration resistivity instrument are effectively improved.

The invention provides a glass fiber reinforced plastic air duct for a rail vehicle. The glass fiber reinforced plastic air duct for the rail vehicle comprises multiple sub air ducts; the sub air ducts comprise an air inlet duct, a horizontal air duct, a bend air duct and an air outlet duct; the air inlet duct is connected with the air outlet duct through the bend air duct and the horizontal air duct; each sub air duct is connected by using a flange so that the air duct is connected to form a whole body; the connecting part of each sub air duct is in sealed connection; rigid connecting pieceshaving effects of air duct main frameworks are arranged at the connecting parts of the air inlet duct, the air outlet duct and a vehicle body; the rigid connecting pieces are bonded and embedded in the pasting process of the air inlet duct and the air outlet duct; structural adhesive layers are arranged on one surfaces of the rigid connecting pieces; and embedded layers are arranged on the other surfaces of the rigid connecting pieces. According to the glass fiber reinforced plastic air duct for the rail vehicle, the integral intensity of the air duct can be enhanced, outside forces borne on the rigid connecting pieces can be completely transmitted to an air duct body, the connecting strength is guaranteed, the appearance is beautiful, the integral strength and airtightness of the structure can be guaranteed, and good sound insulation and heat insulation performance can also be guaranteed.